What kind of hearing aid drying method is better?
At present, there are three main methods for drying hearing aids: color changing silica gel desiccant; electronic drying box; vacuum dehumidification instrument.
The color-changing silica gel particles have a strong adsorption capacity and are capable of adsorbing water molecules in the air. The discoloration ability is mainly due to the addition of the acid-base indicator.(Color code)After water absorptionph When the value moves in the alkaline direction, a color change will occur. The color-changing silica gel reduces the humidity in the sealed drying box, and the humidity inside the hearing aid is exchanged with the gas in the drying box, so that the humidity in the hearing aid is lowered to reduce the humidity in the hearing aid for drying purposes. When using color-changing silica gel, it must be used during the customer’s use.Hearing aid Can not be placed in the dry box, the lid of the box should be tightly closed at any time, otherwise, the water in the air will continue to enter the drying box, the adsorption capacity of the color-changing silica gel will quickly drop color.
The electronic drying box is mainly dried by heat, and the control unit can control the temperature inside the box.40-50Between the degrees, the moisture is evaporated by high temperature, the hearing aid is placed in the box, and the temperature of the body can be heated to the same temperature as the inside of the box, and the moisture inside the machine will also evaporate to the outside.
What kind of hearing aid drying method is better?
The vacuum dehumidification instrument draws air out of the closed chamber to create a vacuum-like environment (it is difficult to achieve a true vacuum, actually a low-pressure environment). The evaporation temperature of water is related to atmospheric pressure. The lower the atmospheric pressure, the higher the boiling point of water. Low, relative moisture will evaporate faster in vacuum. This function process is similar to the ordinary drying box, but the humidity in the vacuum chamber is rapidly and continuously decreased, which is faster than the drying of the ordinary drying box. Therefore, the hearing aid is continuously evacuated in the vacuum chamber, and the inside of the hearing aid is Humidity will also drop a lot.
Among these three methods, the vacuum dehumidification and the drying method of the ordinary silica gel drying box are all carried out at normal temperature. The ordinary silica gel drying is the natural exchange between the moisture in the hearing aid and the drying box, so the drying effect time is relatively slow, so it is suitable. Drying when not wearing for a long time, such as hearing aids can be placed in a common silica gel drying box during sleep at night. The vacuum dehumidifier is a vacuum-like environment for manufacturing. In principle, moisture evaporation is faster than ordinary dry boxes, but it is limited by the physical humidity field measurement method. It is impossible to measure the internal drying curve of the hearing aid. An accurate placement of the hearing aid in the vacuum chamber for the longest time to achieve optimal drying results, many stores are generally placed10-20minute. Both of the above methods have little effect on the hearing aid itself because it does not substantially change the temperature at which the hearing aid is placed.
However, when using a desiccant, be sure to prevent children from eating and getting into the eyes. Some color changing desiccantPHThe value is obviously acidic, and the amount of food intake is not big, but if you accidentally get into a small amount of water (tears), it will be corrosive. You need to rinse it off with pure water immediately.
The electronic drying box is different. It needs to evaporate moisture by raising the temperature of the environment and the internal temperature of the hearing aid. We all know that the high or low temperature will affect the aging speed of the item (especially organic parts). There is a phenomenon. Almost all fitters can observe that the earphones of the ear mold customers will harden and become brittle in a part close to the ear canal, and the side of the hearing aid will become hard and brittle. Many, this phenomenon is mainly because the temperature near one end of the ear canal is higher than the end of the hearing aid, and the temperature of the human body is37Around the degree, many thermometers recommend measuring the ear temperature, that is, the ear temperature is not much different from the body surface temperature. What is the temperature of the drying box? Many dry boxes show a controlled temperature of42-45Degree, but put the hearing aid into the process10After the split, the hearing aid can be taken on the hand and feel a little hot. It is obvious that this temperature may have exceeded45Degree.
Most parts inside the hearing aid are afraid of high temperature, such as the microphone, the sealed connection part of the receiver and the entrance and exit, the waterproof and moisture-proof parts between the hearing aid gap, etc. If the frequent high temperature will accelerate their aging, in reality, the author will encounter some parents because the child More sweating, in order to keep the child’s hearing aids in good condition, electronic drying every day, the time is a little longer, the child’s hearing aids will be affected by the ability to resist sweat, the morning hearing aids are still good, but the child sweats a hearing aid gain There will be a significant reduction in the phenomenon of hearing aid maintenance. However, the advantages of the electronic drying box compared with other drying methods are obvious. The drying effect is clear, the speed is fast, and the drying is thorough, so many people like to use it.
So what kind of drying method do we choose? If the time is sufficient, the weather is dry season, it is recommended to use the drying box or the vacuum dehumidification method is better. Even if there is obvious sweat on the hearing aid, it should be wiped clean and then dried in the ordinary dry box, which will not accelerate the hearing aid. Aging of the device. The electronic drying method is not recommended to be used frequently. It can be considered to be used once every month or half a month. It is obviously not appropriate to use electronic drying every day.
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